For girls who have outgrown the American Girls books and Disney Fairies but aren't yet ready for <i>Twilight.</i><br><br>When Lilu Hart wakes to discover herself in Aventurine&mdash;the place where girls train to become fairy godmothers, keepers of the earth and all its inhabitants&mdash;her mission is to travel across a dangerous marshland to the Castle on Stilts, where she has to rescue a special bird's egg before a devastating magical hurricane hits. If Lilu is to succeed, she must first master her family's talent for weaving the elements. But how can Lilu braid moonbeams? And will she be able to succeed without her twin sister's help?